Step 1 Create macro add: #showtooltip /castsequence [reset=target] Serpent Sting, Explosive Shot, Aimed Shot, Steady Shot, Explosive Shot, Steady Shot, Steady Shot, Explosive Shot, Aimed Shot, Steady Shot, Explosive Shot Configure if you don't have a certain shot, or remove. Step 2). Drag the macro on Bar 3 slot 6-7-8. on all three slots. Then your done.
That macro should probably include a /PetAtack in there somewhere. Your pet is a huge part of saving your ass using GB as a hunter. Make sure you're using PetAttack and make sure you pet's growl is on. GB will range itself to use your ranged attacks.
usually hunters will have their pet on defensive, 1 shot pet goes after it, even first sign of threat pet will go after it..
The problem with my hunter is that he never goes at range. I've seen a lot of whisper asking why I was fighting in melee. thanks